CVE-2025-29934
📋 TL;DR
A vulnerability in some AMD CPUs allows a local administrator to run a SEV-SNP guest using stale TLB entries, potentially compromising data integrity. This affects systems with AMD processors supporting SEV-SNP technology. Only local attackers with administrative privileges can exploit this issue.
💻 Affected Systems
- AMD CPUs with SEV-SNP support
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Loss of data integrity in SEV-SNP guest environments, potentially allowing unauthorized access to sensitive information within secure enclaves.
Likely Case
Limited impact due to requiring local admin access and specific SEV-SNP configuration; most likely results in data corruption rather than full compromise.
If Mitigated
Minimal impact if proper access controls are enforced and SEV-SNP is not used in production environments.
🎯 Exploit Status
Exploitation requires local administrative privileges, specific hardware configuration, and knowledge of SEV-SNP internals.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to AMD security bulletin for specific microcode updates
Vendor Advisory: https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3029.html
Restart Required: Yes
Instructions:
1. Check AMD security bulletin for affected CPU models. 2. Obtain updated microcode from AMD or system vendor. 3. Apply microcode update following vendor instructions. 4. Reboot system to activate new microcode.
🔧 Temporary Workarounds
Disable SEV-SNP
allDisable SEV-SNP feature in BIOS/UEFI settings to prevent exploitation
Requires BIOS/UEFI configuration changes; no OS-level commands
Restrict Administrative Access
linuxLimit local administrative access to systems with SEV-SNP enabled
Implement least privilege access controls
Use sudo/privilege management tools
🧯 If You Can't Patch
- Disable SEV-SNP feature in BIOS/UEFI settings
- Implement strict access controls to limit local administrative privileges
🔍 How to Verify
Check if Vulnerable:
Check CPU model and microcode version: cat /proc/cpuinfo | grep -E 'model|microcode'Check Version:
dmesg | grep -i microcode OR cat /proc/cpuinfo | grep microcodeVerify Fix Applied:
Verify microcode version after update matches patched version from AMD advisory📡 Detection & Monitoring
Log Indicators:
- Unusual SEV-SNP guest creation attempts
- Multiple failed SEV-SNP initialization attempts
Network Indicators:
- None - this is a local hardware vulnerability
SIEM Query:
Search for SEV-SNP related errors or warnings in system logs